Miniature motor for an electronic timepiece including a stator having a non-magnetic reinforcing ring
US4270066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1979 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Jan 8, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C13/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an electronic timepiece motor, a one-piece stator of magnetic material having a hole therethrough bounded by a circumferential sidewall and defining a pair of stator portions connected by narrow bridges having small cross sections. The narrow bridges define a magnetic circuit of high magnetic resistance between the stator portions. A non-magnetic reinforcing ring is disposed within the hole through the one-piece stator and has an outer diameter effective to insure a snug fit of the reinforcing ring with the circumferential sidewall defining the hole through the stator. The reinforcing ring imparts stiffness to the one-piece stator to prevent deformation of the bridges and the hole. The reinforcing ring has a peripheral reinforcing flange extending outwardly and with the flange bearing against the one-piece stator adjacent the hole therethrough for imparting additional stiffness to the one-piece stator. A rotor is mounted for rotation within the hole through the one-piece stator and within the reinforcing ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.